He later adjusted the scale such that the melting point of ice was 32☏ and body temperature was 96☏. He initially based the scale on an equal ice-salt mixture, selecting the values of 30☏ for the freezing point of water, and 90☏ for normal body temperature. History/Origin: The Fahrenheit scale was developed based on a measurement proposed in 1724 by the German physicist Daniel Gabriel Fahrenheit. The interval between the freezing and boiling point is divided into 180 equal parts. It is currently defined by two fixed points: the temperature at which water freezes, 32☏, and the boiling point of water, 212☏, both at sea level and standard atmospheric pressure. Definition: The Fahrenheit (symbol: ☏) is a unit of temperature that was widely used prior to metrication.
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